View the step-by-step solution to:

Question

1.   Unix access control is discretionary in nature. Unix has a few mechanisms to restrict the set of permissions

for a process (chroot, special principal nobody).  Suppose a program is downloaded from the Internet.

a.       How can UNIX use these mechanisms to restrict this program from performing the operations listed below       

b.       Give clear and concrete examples of situations where these operations are necessary?

c.       Is there a mechanism other that discretionary to enable these operations for genuine programs downloaded from the Internet? 

 Your solution should be general so that it applies to all programs that share the same attribute i.e., downloaded from the Internet.

OPERATIONS:

a.       Open a network socket to a remote server and upload certain files to that server

b.       Encrypt certain files on the disk

c.       Act as a proxy for all password protected websites, i.e., send the user's credentials to the website on his/her behalf

 

Recently Asked Questions

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Let our 24/7 Computer Science tutors help you get unstuck! Ask your first question.
A+ icon
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors